Re: 6569 luminances

From: Gerrit Heitsch <>
Date: Sun, 08 Jul 2012 17:20:58 +0200
Message-ID: <>
On 07/08/2012 04:20 PM, wrote:
> On 2012-07-08, at 15:19, Gerrit Heitsch wrote:
>> On 07/08/2012 02:40 PM, wrote:
>>> I laid out something like here:
>>> trying to keep the signal paths (traces) short. It is not yet meant to be placed in the metal housing of the modulator but if that works well I may take some efforts to make a replacement board that goes inside the metal case. The "upper" part is an audio amp for the SIDs.
>>> Any comments / striking errors in this? What should I put more attention to?
>> I see you use pad 1 in this layout. At least on the 250466-Board this is the power supply for the modulator, but it's not +5V but unregulated +9V (usually a bit more). Same goes for a 250407 board. So you either need to add a 78(L)05 or grab the +5V from somewhere else.
> There is a pinhead for +5V to be used for the Y/C amp. That +9V is to be used (via jumper) to power the audio amp in case I like it and want more output ;-)

Ok... Then keep in mind that on the 250469 boards (the ones with the 
64pin 'PLA'), the modulator pinout is slightly different and it's 
powered with +5V. It's also smaller.


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Received on 2012-07-08 16:00:10

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